Good after Guys,

I have recently noticed that my 2018 SQ7 is getting hard to start, in terms of sometimes / randomly it takes a couple of goes to start when i push the start button. On some occasions it starts and then cuts out straight away and others it does start straight away but ticks over very roughly and shakes the engine aswell as when i push the pedal in neutral from 800 rpm to 1300 rpm its not smooth and the rev needle bounces.
My friend is a Land Rover Tech and suggested changing the fuel filter for a start which he did and the fuel filter was black with little bits in it which he is thinking is the HPFP starting to break up. Hence me asking you guys what you think. My mate does have the VCAS diagnostic machine which shows 'low pressure fuel system pressure too low' P008A00 if that means anything to you guys.

Apart from this what a car!!!

Thanks in advance for any assistance you can give.